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Tony Trout
07-10-2008, 12:54 AM
New DNA Technology Clears Family JonBenet Ramsey (http://www.nytimes.com/2008/07/10/us/10ramsey.html?ref=us)


DENVER — A persistent thread among conspiracy theorists and true-crime bloggers who for years have pondered the murder of JonBenet Ramsey, the child beauty queen found strangled in her family’s home in nearby Boulder more than 11 years ago, is that the police and prosecutors inadequately investigated whether her killer was a member of the family.

On Wednesday, the Boulder County district attorney, Mary T. Lacy, said definitively that the whispers about prosecutorial plots and favoritism were fantasy. A new technique of analysis, Ms. Lacy said in a letter to JonBenet’s father, John Ramsey, has found DNA traces, unobtainable by earlier methods, of an unidentified male on the long johns JonBenet wore the night she died.

The DNA is not from a member of the Ramsey family and is almost definitely that of the killer, who would have presumably removed or otherwise handled the long johns, Ms. Lacy said.

The genetic material matches that from a drop of blood found on JonBenet’s underwear early in the investigation. The authorities determined then that the blood was not from a member of the Ramsey family but could not say whether it came from the killer, Ms. Lacy said.

The letter to Mr. Ramsey said the new evidence “has vindicated your family,” adding, “No innocent person should have to endure such an extensive trial in the court of public opinion.” It said specifically that neither Mr. Ramsey nor his wife, Patsy, who died of cancer in 2006, nor their son, Burke, was “under any suspicion in the commission of this crime.”

Two years ago, Ms. Lacy’s office announced with great fanfare the arrest of a suspect, John M. Karr, after what Ms. Lacy described at the time as “several months of a focused and complex investigation.” But Mr. Karr’s DNA did not match, and less than two weeks later Ms. Lacy announced that he had been cleared of suspicion.

The methodology that led to Wednesday’s announcement, called “touch DNA” analysis, is essentially a way of looking for traces of genetic material that earlier methods would have overlooked.

Ms. Lacy said a private laboratory, the Bode Technology Group of Lorton, Va., had tested material scraped from the waistband of the long johns and found a match with the earlier samples taken from the crotch of the underwear JonBenet wore on the night of the crime.


Thoughts?

Evanescence
07-10-2008, 04:23 AM
I was always on the fence with the parents...but do believe in the accuracy of DNA....

So, who really DID do it?

The amount of unsolved murders is staggering...

We got 3 here in Central, PA....

sandie
07-10-2008, 09:22 AM
This was on the news here last night, too. It's great that there are such advances with DNA.

HotWireD
07-10-2008, 09:51 AM
When I first started working in the forensics field about 25 years ago, we did not have the benefit of DNA profiling.

We had a rule of thumb - a blood stain about the size of an old fifty 'new pence piece' (off my head - about the size of one and one half US dollar coins, or an Australian Kookabura coin) would yield four blood groups - ABO, PGM etc

The odds of having each of the blood groups were multiplied giving, at best, statistics of 1 in 242 (if I recall correctly - it was a long time ago :) ).

With DNA we get figures in the millions and billions, much more comfortable figures for presenting in court - and the amount of material needed is hundreds, if not thousands of times smaller! Sometimes, 'if you can see it, it is enough' for a full profile.

There are still issues with close relatives (reducing the odds from millions to tens of thousands (which is still enormous)), but as a tool for 'eliminating' people from an enquiry (not killing them, just showing the material was not theirs) it is great.

With 'Touch DNA' (which I think is the same as LCN DNA (Low Copy Number DNA), or it may the recovery method that is then processed using LCN DNA techniques) you do not have to even be able to see the DNA material - just know where to attempt the recovery from.

The wonder of DNA is that it will make copies of itself if it is placed in an environment that replicates the inside of a living cell - just give it warmth, moisture and the building block chemicals, heat it up and cool it down and hey presto - it doubles in quantity (repeat this several times and hey presto! it doubles each time (2x, 4x, 8x, 16x, 32x...) So even if you do not have enough to start with you could theoretically 'grow' enough to be able to see it with the naked eye. Of course, it is complicated by the 'background DNA' which is also present - such as older DNA in the same area, the victim's DNA and that of bacteria etc, which gets multiplied up as well.

I send off clothing (hoods, masks, gloves, even footwear), swabs from cigarette lighters, chewing gum, cigarette ends, blood sputum - I could go on - their are lots of ways of leaving DNA at a scene - and regularly get results.

The 'hits' that fascinate me are the links to other crimes. I can send off a blood stain from a burglary and get a result stating that the same DNA was recovered from a burglary in Scotland, or from a sexual offence hundreds of miles from my city.

We have had a series of high profile drugs factories and we get results back linking the scene to another factory in another county, showing that these offenders are moving on and travelling the country trying to set up drugs manufacturing sites each time they get discovered.

sandie
07-10-2008, 11:20 AM
Interesting comments, David. Thanks. :)